Use :recycle of :asdf/find-system in :asdf/source-registry to migrate symbol
initialize-source-registry that moved from that previous packages
(otherwise, upgrade from 3.2.1 breaks on all lisps).
Also :recycle :asdf/action in :asdf/plan for required-components and
traverse-action. But avoid interning plan in asdf/action so it doesn't
confuse clisp when upgrading from 2.26(!).